Centrifugal pump installation comprising an air-separating device



April 19, 1932- H. LAUCHENAUER 1355,06]

GENTRIFUGAL PUMP INSTALLATION COMPRISING AN AIR SEPARA'I'ING DEVICE Filed Jan. 6, 1931 2 Sheets-Sheet l I lam /2Z0]? April 1932- H. LAUCHENAUER 1,855,061

CENTRIFUGAL PUMP INSTALLATION COMPRISING AN AIR SEPARATING DEVICE Filed Jan. 6, 1931 2 Sheets-Sheet 2 Patented Apr. 19, 1932 UNITED STATES PATENT "orrlcs I cnm'muen. rum msnna'rxon corr'rmsrne m msnrana'rme nn'vicp Application filed January 0,1031, Serial 110.5%,942, Bil-(I111 Switzerland .January 14, mo.

nected with the suction port of the-pump by way of an ejector acting in the direction of the suction action of the pumpand the suction chamber of said ejector is connected with 0 the suction conduit of the pump by means of a pipe knee extending above the pump.

In a known arrangement comprising special pumps of this type, the entire air-separating device was enclosed together with the 0 pump in a common casing; but th1s a rrangement had the disadvantage that the n ector was permanently kept running during the operation of the pump, thus continuously causing eddies in the water circulation inside the pump, which was accompanied by a corresponding loss of energy.

' To overcome this drawback it has already been proposed to employ'mechanically op-" erated closing members, in the formpfshutoff valves, for the circulating conduit of the ejector; but from this arrangement, part cularly when low water heads or the pumping of waste water and excrement were involved,

v so many sources of failure ensued that clog-a 3 'ng of the respective closing member was ound to occur, thereby frustrating. its effectiveness.

' The same applies to similar arrangements in which a non-return valve was provided inthe suction conduit. 1

According to the invention this drawback is eliminated in the pump installation by connecting the air-separator included in the pressure conduit in a known manner with the delivery pressure conduit, by means of a sec-' from circulating in the ring conduit constitutedb the pump, the connecting pipe therethe pump; so that in the normal operation of the pump no loss of energy is involved.

The device is particularly adapted to be used n connection with installations for pumpmg waste water and excrement, and for all cases where every time when the pum is started replenishing of the suction conduit is to be avoided.

In-the accompanying drawings, two constructlonal forms of the installation are illustrated, wherein constructional form; and

Fig. 2 a similar view of a second constructional form;

Fig. 3 shows a detail section of Fig. 2.

In the constructional form, as shown in Fig. 1, the centrifugal pump 1 has a pressure connection 1d which is connected with the air separator'3, situated above the pump, by a horizontal connecting pipe 2. The lower end Fig. 1 is a schematical elevation of a first of the air-separator communicates with a nozzle 3a of an ejector II, the delivery end 5.

of whichis connected with the pressure conduit 6 containing a non-return valve 7. To.a lateral connection 8 of the suction chamber 4: of the ejector II, the nozzle 9 of another ejector I is fastened, the delivery end 10 of which communicates with the suction end 18 of the pump l. The suction pipe 12 is formed at its v mucmaunn, or zuarcn, swrrzmmn, assrauon r0 m1 m1: mcnmnnmnnm A. n. SIHLVA. a. vomu. A. scmnn, or zumcn, swrrznnnmn tion conduit even when the from completely flowing of through the sucump 1S stopped; so'that the entire device with the inclusion of the pump is at all times at least up to the level it. As soon as the pump starts to run, the ejector I-is rendered operative, so as tov cause the water contained in the ring conduit, constituted by the pump 1, connecting pipe 2, air-separator 3, pressure conduit and e ector II, e ector I and delivery end to circulateand to remove the air from the suction conduit by action of the ejector I, thus initiating the suction action of the pump immediatel As soon as the pump begins to deliver, t e ejector'II is also rendered operative in the direction of the delivery, and the relative capacities of the ejectors I and H are such that the ejector II discharges the entire outputof the pump into the delivery pressure conduit, thusr'endering the ejector I inactive, so much more,.

as the pipeconnectionS is branched ofi laterally of the suction chamber 4; i.- e., at right angles to the spout issuing from the ejector II. Consequently. the water circulation in the above-described ring conduit is ceased, so that no loss of ener is involved. 7

Alternatively, the air-separator 3 may be omitted and in its place an air pressure-equalizing device, in the form of a vent valve, in-

serted in the pressure conduit, or else the airseparator may directly be provided with a vent valve, r

An arrangement of this kind is shown in the Figures 2 and 3. The vent valve V illustrated' in Fig.3 is mounted within a housing 21 and providedwith a valve casing 22 accommodating a valve body 23 which opens downwardly. Above the valve seat in the valve casing 22, lateral air inlet openings 2211 are bored. The stem carrying the valve body ispassed through the top of the valve casing and guided at its upper end by means of a transverse pin in longitudinal slots of two intercrossing links 25, the outer ends of which are pivotally mounted in the housing 21. The other ends of the two links are engaged by connecting rods 26 of two armatures 27 of electromagnets. The coils 28 of the magnets are connected in series via the loop, conductor 29 with the supply conduit of the driving motor.

Fig. 2 shows the manner in which the valve is assembled with the automatically sucking centrifugal pump installation comprising a driving motor M for the centrifugal pump P,

" an air-separator N directly connected to an K of the suction conduit the vent valve V is filled with water arranged, the ma et coils of which are included in the circuit of the motor M by way of the conductor 29. As soon as for starting the ump the motor is connected, the body 01 the valve V' is pressed on its seat by action of the electroma nets, thereby sealing the suction conduit in t e required air-ti ht manner. When the motor is disconnecte the valve body is released, thus permitting of air flowin into the suction conduit as indicated by t e a'rrows in Fig. 3, 'whereuponthe water circu-' lation in the suction pipe is immediately interrupted and a siphon effect .in the pump prevented, so that t e installation remains at all times filled up to the level n. a

The efiect of the vent valve is instantaneous and sure to take place, so much more, as the valve is at no time in contact with the liquid conveyed through the pump, and with the vent valve bodyt in. any position a suc-. tion efiect is present in the suction conduit. Consequently, the vent valve is ensured against rusting by corrosive action of all impurities contained in the liquid, and its parts are prevented from binding one on the other.

I claim: I 1. In a'pumping installation including an air-eliminating device, in combination, a centrifugal pump, an ejector inserted between the pressure conduit and the suction conduit of said pump and actin in the direction of the suction action 0 the latter, a suction chamber provided on said ejector, a pipe knee inserted-inthe suction conduit of said pump to extend from said suction chamber above the latter, an air-separator included in the pressure conduit of said pump,

a second ejector inserted between the pressure conduit of said umpand said air-separator and acting in the direction of the pump delive and a suction chamber provided on sai second ejector and communicating with saidfirst ejector.

2. In a pumping installation actuated by an electric motor and including an air-elimina-ting device, in combination, a centrifugal pump, an ejector inserted between the pressure conduit and the suction conduit of said 5 pump and acting in the direction of the suc tion action of the latter, a suction chamber provided on said ejector, a pipe knee inserted 1n the suction conduit of said'pump to exconnecting means arranged between said magnets and said motor for closing said valve, 1;.-

due to current flowing through said motor, a second ejector inserted between the pressure conduit of said pump and said air-separator and acting in the direction of the pump delivery, and a suction chamber provided on said second ejector and communicating with said first ejector. 3. In a pumping installation actuated byan electrical motor and including an aireliminating device, in combination, a centrifugal pump, an ejector inserted between the pressure conduit and the suction conduit of said pump and acting in the direction of the suction action of the latter, a suctionchamber provided on said ejector, a pipe knee inserted in the suction conduit of said ump to extend from said suction chamber above the latter, anair-separator included in the pressure conduit of said pump, a vent valve controlled b said motor and communicating with sai suction conduit for admitting atmospheric air thereto, a valve casing for said vent valve, a valve body vertically slidably arranged in said valve casing, air inlet openings provided in said valve casing above the valve seat, two ,electromagncts associated with said vent valve, an operative connection inter osed between said electromagnets and sai vent valve, electrical' connecting means arranged between said magnets and said motor for closing said valve due to current flowing through said motor, a second ejector inserted between the pressure conduit of said pum and said air-separator and acting in the irection of the pum deliver and a suction chamber provide on sai second ejector and communicating with said first ejector. i

4. In a pumping installation actuated by an electrical motor and including an aireliminating device, in combination, a centrifugal pump, an ejector inserted between the pressure conduit and the suction conduit of said pump and acting in the direction. of the suction action of the latter, a suction chamber provided on said ejector, a'pi e knee inserted in the suction conduit of sai pump to extend from said suction chamber above the latter, an air-separator included in the pressure conduit of said pum a vent valve controlled by said motor an communicating with said suction conduit for admitting atmospheric air thereto, a valve casing for said'vent valve, a valve body vertically slidably arranged in said valve casing, air inlet 1 openings provided in said valve casing above the valve seat, two electromagnets associated with said vent valve, an armature arranged in each electromagnet, a common-- housing provided for saidiventvalve and said electromagnets, two intercrossing links centrally attached to said valve body and pivotally connected at their one ends with said'housing and at their other ends with said armatures of said electromagnets respectively, electrical connecting means arranged between said magnets and said motor for closing said valile due tocurrent flowin through said motor, a second ejector inserte between the pressure conduit of said pump and said air-separator and acting in the direction of the pump delivery, and a suction chamber provided on said second ejector and communicating with said first ejector.

In testimony whereof I havevsigned my name to this specification.

HERMANN LAUCHENAUER. 

